Using the S blade, fully process the onion.
Peel and grate potatoes.
Whisk the eggs well in a bowl.
Place your raw meat and marrow bones into the slow cooker.
Add the oil, salt, pepper and whisked eggs into the grated potatoes and mix well. Pour over the raw meat.
Add the sliced beef fry on top for flavor. Sprinkle some black pepper on top.
Cover and let it cook on low overnight.